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Identify the spectral line having wavele...

Identify the spectral line having wavelength of `4.863xx10^(-5)cm` in the emission spectra of hydrogen.

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Wave no, `overline(v)=[(1)/(2^(2))-(1)/(n^(2))]` [given, `lamda=4.863xx10^(-5)cm`]
`therefore overline(v)=(1)/(lamda)=(1)/(6.863xx10^(-5))=109678=[(1)/(4)-(1)/(n^(2))]`
`therefore (1)/(n^(2))=(1)/(4)-(1)/(4.863xx10^(-5)xx109678)=0.0625 or, n=4`
The spectral line with wavelength `4.863xx10^(-5)cm` is `H_(beta)`.
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